A veteran cameraman working for Russia’s Channel One was killed in eastern Ukraine when a bus carrying journalists and soldiers’ mothers was hit by gunfire, the station said Monday.

Anatoly Klyan, 68, who had worked for the state channel for 40 years, was the fifth journalist to be killed since the fighting began in April between Ukrainian government troops and armed pro-Russia separatists.

Channel One said its crew was traveling late Sunday to a Ukrainian military base with mothers of conscripts hoping to bring their sons home when their bus came under attack near Avdiivka, a village just north of the city of Donetsk.

Russia’s Foreign Ministry blamed the attack on Ukrainian soldiers and demanded an objective investigation into the attack and for those responsible to be punished.

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Video footage of the attack broadcast on Channel One showed Klyan continuing to film inside the bus even after he was shot in the stomach, stopping only when he grew weak and telling his colleagues “I can’t hold the camera any longer.” Other journalists helped him into a passing car to be taken to a nearby medical center, but the television station said doctors were unable to save him.

The bus driver also was hit in the head. He was filmed holding his left hand to his bloody, shaven head while continuing to drive with his right hand until it was safe to stop.

Channel One said the trip was organized by the rebel fighters and that the bus, whose driver was wearing camouflage, came under fire as it approached the military base. It was dark at the time and it was unclear whether those shooting could tell who was in the bus.

Ukrainian conscripts serving in eastern Ukraine tend to be from the region, where the majority of the population is Russian-speaking. Many conscripts may have little loyalty to the Kiev government or openly support the separatists.

Whatever the case, the mothers headed to the based Sunday night wanted to protect their teenage sons from a military conflict that has already killed more than 400 people.

The Russian Foreign Ministry said the attack showed that Ukraine’s armed forces were not interested in a de-escalation of the military conflict and accused Ukraine of deliberately putting the lives of Russian journalists in danger in an effort to prevent them from reporting the truth.

Ukrainian prosecutors announced that they were investigating the attack on the bus.

Four other journalists have been killed in eastern Ukraine. A correspondent and cameraman working for Rossiya, the other Russian state network, were killed June 18 after being hit by mortar fire near the city of Luhansk. On May 24, an Italian photographer and his Russian colleague were caught in a mortar attack near Slovyansk.

Both sides have been accused of violating a 10-day cease-fire, which was set to expire at 10 p.m. Monday local time (1900GMT).

Monday also was the deadline that the European Union set for Russia and the separatists to take specific steps to ease the violence. Otherwise, EU leaders warned that they were ready to impose further sanctions.